History 1: https://backpack.tf/item/2793391140

3 keys 43 ref:

https://backpack.tf/profiles/76561199111073161#!/compare/1633305600/1633392000

https://backpack.tf/profiles/76561198041108750#!/compare/1633305600/1633392000

keys were ~58.66 ref https://gladiator.tf/listings/615a1f5c42fcf41607d86ff4

43/58.66=0.73 keys. The sale is 3.73 ~3.75 keys

Untrace:

https://backpack.tf/profiles/76561198041108750#!/compare/1635465600/1635552000

https://backpack.tf/profiles/76561198418708214#!/compare/1633305600/1637712000

QSStore dump:

https://backpack.tf/profiles/76561198418708214#!/compare/1633305600/1637712000

https://backpack.tf/profiles/76561199110809353#!/compare/1637625600/1637712000

3 keys 26 ref:

https://backpack.tf/profiles/76561199110809353#!/compare/1637712000/1637798400

https://backpack.tf/profiles/76561198280524116#!/compare/1637712000/1637798400

keyw ere ~63.44 ref https://gladiator.tf/listings/619ebeace06c9204aa891e1d

26/63.44=0.41. The sale is 3.41 ~3.4 keys

Account transfer:

https://backpack.tf/profiles/76561198280524116#!/compare/1637798400/1637884800

https://backpack.tf/profiles/76561198029074524#!/compare/1637798400/1637971200

then went to mptf

History 2: https://backpack.tf/item/7264785120

Mannco seller

History 3: https://backpack.tf/item/4082874534

Untrace:

https://backpack.tf/profiles/76561198188093413#!/compare/1634860800/1634947200

https://backpack.tf/profiles/76561198983856237#!/compare/1634860800/1634947200

History 4: https://backpack.tf/item/2695903512

Mannco seller

~~

https://mannco.store/item/11019

$6.59 / $1.71 = 3.85 keys

$6.59 / $1.69 = 3.90 keys

~~

https://marketplace.tf/items/tf2/1114;5;u3020

$9.99 / $1.87 = 5.34 keys ~5.35 keys

$9.99 / $1.80 = 5.55 keys

Taking 3.4-5.55 keys here